Regioselective Synthesis of Highly Functionalized Pyrazoles from <i>N</i>-Tosylhydrazones
作者:Qian Zhang、Meng Tang
DOI:10.1021/acs.orglett.9b00561
日期:2019.3.15
A regioselectivesynthesis of highly functionalized pyrazoles from N-tosylhydrazones was developed. The reaction was general for a wide range of substrates and demonstrated excellent tolerance to a variety of substituents, and the method has been successfully applied to the formal synthesis of ibrutinib.
Visible-Light Photocatalytic Aerobic Annulation for the Green Synthesis of Pyrazoles
作者:Ya Ding、Te Zhang、Qiu-Yun Chen、Chunyin Zhu
DOI:10.1021/acs.orglett.6b01867
日期:2016.9.2
A selective and high yielding synthesis of polysubstituted pyrazoles through a VLPC (visible light photoredox catalysis)-promoted reaction of hydrazine with Michael acceptors is reported. The method employs very mild reaction conditions and usesair as the terminal oxidant, which makes the process environmentally benign. Different types of Michael acceptors with various substituents can undergo the